They were unable to reproduce the results of the first experiment when they repeated it 當(dāng)他們重做它時,他們不能重現(xiàn)再生第一次實驗結(jié)果。
The bears'disappearance would probably take place as young cubs failed to survive to adulthood and females were unable to reproduce successfully 北極熊也許會因為幼仔無法活到成年,以及雌雄不能成功繁衍而消失。